BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, OCTOBER 31, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED Today's observations: 8 A.M. EDT Weather: Thin scattered cirrus Temperature: 31F, Dew point: 25F, Wind: SW at 11 kts Sea-level pressure: 30.44 inches Hg, rising Visibility: 70 miles 6-hourly minimum temperature: 29F BHO SA 1155 250 –SCT 70 307/31/25/2211/044/ 8/001 55001 10032 20029 11 A.M. EDT Weather: Clear, few cirrus distant NE-SE Temperature: 47F, Dew point: 23F, Wind: SW at 14 kts, Wind: Direction variability S-W Sea-level pressure: 30.36 inches Hg, falling Visibility: 70 miles BHO SA 1455 CLR 70 282/47/23/2314/036/ FEW CI DSNT NE-SE THN K LYR N-NE WND 19V27/ 8/001 58025 WEATHER SUMMARY FOR THURSDAY, OCTOBER 30 TEMPERATURE (DEGREES F) MAX.....45 NORMAL.....55 MIN.....29 NORMAL.....39 MEAN....37 NORMAL.....47 DEPARTURE FROM 30-YEAR NORMAL.............-10 TOTAL DEPARTURE FOR THE MONTH..............-9 [-0.5 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............28 DEPARTURE.......+10 TOTAL HEATING UNITS FOR THE MONTH...........406 DEPARTURE........+2 TOTAL HEATING UNITS FOR THE SEASON..........522 DEPARTURE.......-51 TOTAL HEATING UNITS LAST SEASON TO DATE.....335 DIFFERENCE.....+187 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............30 W AT 2:29 P.M. AEROVANE.............28 WNW AT 2:42 P.M. * ASOS.................30 WNW AT 2:30 P.M. DAVIS................31 W AT 2:42 P.M. FASTEST MILE FOR YESTERDAY..............21 WNW AT 2:43 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........21 NW AT 2:49 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........22 WNW AT 2:48 P.M. AVERAGE............12.2 W ASOS...............11.5 DAVIS..............12.6 W [276 deg] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE.......-0.15 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.04 DEPARTURE.......-2.23 ASOS..............2.04 TOTAL PRECIPITATION FOR THE YEAR..........44.94 DEPARTURE.......+3.07 ASOS.............47.52 # # Includes erroneous ASOS precipitation data on 2/13/08. PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 10/1 68/58/63/+6/0.49/120/17 38 SW TSTM # 10/2 62/46/54/-2/0.11/455/65 45 W 10/3 62/45/54/-2/T/376/54 44 SSW Aero 43 MPH SSW 10/4 61/40/51/-5/0.00/612/88 32 WSW 10/5 53/45/49/-6/T/000/00 18 WNW 10/6 58/39/49/-6/0.00/303/44 28 WNW 10/7 64/37/51/-4/0.00/687/100 23 WNW 10/8 69/43/56/+2/0.00/581/85 32 S Aero 30 MPH S 10/9 72/55/64/+10/0.02/510/75 33 WSW 10/10 69/53/61/+7/0.00/664/98 29 W 10/11 68/49/59/+6/0.00/668/99 20 NNW 10/12 67/47/57/+4/0.00/625/93 21 W 10/13 62/50/56/+4/0.00/308/46 20 NE 10/14 65/50/58/+6/0.00/514/77 30 SSE 10/15 64/52/58/+6/0.00/618/93 21 ENE 10/16 67/51/59/+8/T/026/04 35 NW 10/17 59/42/51/0/0.00/474/72 26 NW 10/18 51/37/44/-7/0.00/440/67 25 N 10/19 46/36/41/-10/0.00/176/27 36 NNE Aero 36 MPH NNE 10/20 54/34/44/-6/0.00/631/97 25 N 10/21 59/43/51/+1/0.01/129/20 20 W 10/22 44/38/41/-9/0.10/000/00 32 NNW 10/23 45/31/38/-11/0.00/520/81 23 N 10/24 62/34/48/-1/0.00/589/92 22 WSW 10/25 66/44/55/+6/0.28/038/06 60 SSE Aero 61 MPH SSE TSTM 10/26 64/48/56/+8/0.60/418/66 55 SSE Aero 60 MPH SSE 10/27 66/47/57/+9/0.00/631/100 21 NNE 10/28 51/36/44/-4/0.43/063/10 42 SSE 10/29 44/32/38/-9/0.00/157/25 43 SW 10/30 45/29/37/-10/0.00/.../.. 30 W 10/31 morning low temp. 29F; normal low temp. 39F # Thunderstorm gust NEW DAILY RECORDS FOR OCTOBER None... DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 31 HIGH 79 IN 1946 LOW 22 IN 1904 PRECIP 3.74 INCHES IN 1991 SNOWFALL TRACE IN 1906 PEAK GUST 70e S IN 1945 RECORDS FOR NOVEMBER 1 HIGH 75 IN 2003 LOW 22 IN 1913,1923 PRECIP 2.93 INCHES IN 1985 SNOWFALL TRACE IN 1906,1951 PEAK GUST 78 ESE IN 1997 TODAY'S REPORT PREPARED By: Stephanie Radner